146 Of the Management of Fire 



which form the bottoms of six ovens on the same level, 

 and joining each other by their sides, which are concealed 

 in the cylindrical mass of the brick- work. Each of these 

 plates of cast iron being in the form of an equilateral tri- 

 angle, they all unite in the centre of the cylindrical mass 

 of brick-work, consequently the two sides of each unite 

 in a point at the bottom of it, forming an angle of 60 

 degrees. 



The flame, after circulating under the bottoms of these 

 ovens, rises up in two canals concealed in the front wall 

 of each oven, and situated on the right and left of its 

 mouth, and after circulating again in similar flues on the 

 upper flat surface of another triangular plate of cast iron, 

 which forms the top of the oven, goes off upwards by a 

 canal furnished with a damper into a hollow place, situ- 

 ated on the top of the cylindrical mass of the brick-work, 

 from which it passes off in a horizontal iron tube, about 

 7 inches in diameter, suspended near the ceiling of the 

 room, into a chimney situated on one side of the room. 



These six ovens which are contiguous to each other in 

 this mass of brick-work are united by their sides by thin 

 walls made of tiles, about \\ inches thick and 10 inches 

 square, placed edgewise ; and each oven having its sep- 

 arate canal, furnished with a register communicating with 

 the fire-place, any one or more of them may be heated 

 without heating the others, or the heat may be turned off 

 from one of them to the other in continual succession ; 

 and, by managing matters properly, the process of baking 

 may be uninterrupted. As soon as the bread is drawn 

 out of one of the ovens, the fire may immediately be turned 

 under it to heat it again, while that from under which the 

 fire is taken is filled with unbaked loaves, and closed up. 



A principal object which I had in view in constructing 



